Article
Thermodynamics
Junjun Guo, Xudong Jiang, Hong G. Im, Zhaohui Liu
Summary: In this study, the contributions of gas, soot, and coal particles to total radiation in pulverized coal combustion were examined. The results showed good agreement between the predicted distributions of coal particles, tar, and soot and experimental data. Accurate prediction of radiation heat transfer in pulverized coal combustion requires considering all components.
COMBUSTION AND FLAME
(2022)
Article
Mechanics
Yujia Sun, Ying Yu, Qing Chen, Lin Jiang, Shu Zheng
Summary: Liquid fuel pool fires are common in practical applications. This study investigates the flame properties and thermal radiation characteristics of a 1 m diameter methanol pool fire. The results show that the flame structure is affected by turbulent mixing and combustion, leading to frequent upward movement and air entrainment. The radiative heat feedback exhibits strong temporal and spatial variations, with the weighted-sum-of-gray gases model performing better in predicting the radiative heat feedback.
Article
Thermodynamics
L. He
Summary: The present work develops a methodology for predicting convective heat transfer of flow bounded by a non-isothermal wall. It proposes a framework centered around Spectral Heat Transfer Coefficients (SHTC), which are influence coefficients for a small number of spectral modes of wall temperature disturbances. The framework is implemented with a unified Fourier spectral method applicable to both periodic and non-periodic wall temperature distributions.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2023)
Article
Energy & Fuels
Shiquan Shan, Binghong Chen, Zhijun Zhou, Yanwei Zhang
Summary: By studying the spectral radiation characteristics of semi-coke jet flame, this research found that the intensity of radiative energy and exergy increases with oxygen ratio and temperature. The spectral radiation below 1.1-3 micrometers shows high utilization potential and exergy-to-energy ratio can reach between 76% and 85% in the waveband below 3 micrometers. Temperature is the main factor affecting the radiation exergy.
Article
Thermodynamics
Karekin D. Esmeryan, Teodor Grakov, Lazar G. Vergov, Yuliyan Lazarov, Yulian Fedchenko, Stefan Staykov
Summary: Except in microelectronics, food industry and power generation, accurate temperature control is essential for cryobiology's sustainable development. This research quantifies the thermal behavior of different types of soot and finds that soot with 50-120 nm-sized nanoparticles, mesopores, moderate surface oxidation, and thickness exceeding 50 μm has the greatest capacity to delay heat conduction. By combining specific physicochemical features through controlled synthesis and functionalization, custom cryovials can be fabricated to alleviate freezing injury.
APPLIED THERMAL ENGINEERING
(2023)
Article
Engineering, Electrical & Electronic
Sucheta Sharma, Toni Laurila, Jussi Rossi, Juho Uotila, Markku Vainio, Farshid Manoocheri, Erkki Ikonen
Summary: A sensitive photoacoustic detection approach utilizing a silicon cantilever is investigated for measuring the power of electromagnetic radiation. The technique, activated by pressure waves generated from radiation-induced heat, exhibits high sensitivity across a wide spectral range from 325 nm to 1523 nm. The implemented method demonstrates a linear response in measuring radiation power from 15 nW to 6 mW, with a dynamic range of nearly six orders of magnitude. A numerical model is developed to optimize the measurement sensitivity, and the results align well with experimental findings. This electromagnetic power detection technique shows promising potential for industrial applications and scientific studies.
SENSORS AND ACTUATORS A-PHYSICAL
(2022)
Article
Thermodynamics
Hernando Maldonado Colman, Alberto Cuoci, Nasser Darabiha, Benoit Fiorina
Summary: Modeling soot formation is a challenging task, and the innovative virtual chemistry approach provides a new optimized global method for simulating turbulent sooting flames. This approach optimizes thermochemical parameters to describe combustion systems, trains thermochemical properties using genetic algorithms, reduces computational costs, and effectively predicts combustion system characteristics.
COMBUSTION AND FLAME
(2022)
Article
Mechanics
Rizwan Ul Haq, Tabinda Sajjad, Muhammad Usman, Anum Naseem
Summary: This article presents a study on mixed convection in the presence of a magnetic field near an oblique stagnation point in micropolar nanofluid. Similarity transformations are used to convert the governing partial differential equations into non-linear ordinary differential equations, which are then solved using the modified Chebyshev collocation method. The accuracy of the method is demonstrated by comparing the numerical results with those obtained using the finite difference method. The study provides graphical results for velocity components, microrotation, temperature, and flow patterns, and calculates numerical values for various parameters such as the free parameter, skin friction, and Nusselt numbers. The findings reveal that the microrotation profiles are influenced by the stretching effect and the angle of strike, while the temperature of the micropolar nanofluid is affected by the magnetic parameter and micropolar coefficient. The temperature gradient of the nanofluid decreases with increasing values of the stretching parameter and the angle of strike.
Article
Engineering, Chemical
Siqi Zhao, Shuyang Wang, Haizhen Ding, Zhenqi Guo, Mthokozisi B. C. Simelane, Qiang Liu, Tingting Tao, Liping Guo, Le Chang, Chao Ding
Summary: A novel infrared radiation (IR) peeling method was developed as an alternative to conventional methods for peeling potatoes. A numerical model was developed and solved to predict the temperature distribution in potatoes subjected to different heating times. The model adequately described the heat transfer process during IR peeling, indicating insubstantial damage to the integrity of potato flesh. The results serve as a theoretical basis for the application of IR in peeling potatoes or other vegetables.
JOURNAL OF FOOD ENGINEERING
(2023)
Article
Thermodynamics
Junjun Guo, Lingqi Shen, Xiaoyi He, Zhaohui Liu, Hong G. Im
Summary: The study evaluates the weighted sum of gray gases (WSGG) models for turbulent jet diffusion flame simulations, showing that the model based on mixture modeling provides good prediction accuracy with lower computational cost. The combination of mixture modeling with non-gray soot radiative property model offers the best accuracy for gas-soot mixture.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2021)
Article
Multidisciplinary Sciences
Hassan Waqas, Umar Farooq, Zahir Shah, Poom Kumam, Meshal Shutaywi
Summary: The use of nanofluid in cooling technology is increasing, with research focusing on the importance of bioconvection in nanotechnology and biological systems. The study covers fuel cell models, C-C heat and mass flux model, as well as the properties of activation energy and thermal conductivity. The research also explores the application of nanofluid in various fields and investigates flow-field parameters with numerical results and graphs.
SCIENTIFIC REPORTS
(2021)
Article
Multidisciplinary Sciences
Ahmad Banji Jafar, Sharidan Shafie, Imran Ullah, Rabia Safdar, Wasim Jamshed, Amjad Ali Pasha, Mustafa Mutiur Rahman, Syed M. Hussain, Aysha Rehman, El Sayed M. Tag El Din, Mohamed R. Eid
Summary: In this paper, the hydromagnetic mixed convection flow of viscoelastic fluid caused by a vertical stretched surface is studied. Numerical simulations and graphical portrayals are conducted to investigate the influence and characteristic behaviors of physical parameters on the velocity field and temperature distributions. The results show that the applied magnetic parameter improves the temperature distribution of the viscoelastic fluid and reduces the temperature gradient at the border. The temperature distribution and thermal layer are improved due to radiative and viscous dissipation characteristics. Additionally, higher velocities are observed in the viscoelastic fluid compared to the Newtonian fluid.
SCIENTIFIC REPORTS
(2022)
Article
Energy & Fuels
Samuel Cowart, Gautham Krishnamoorthy
Summary: A methodology for modeling soot production in ethylene-O-2/CO2 diffusion flames based on a skeletal reaction mechanism and the soot nucleation parameter C-alpha showed good agreement with measurements. The study revealed that in-flame radiation is influenced by gas-radiative property models, while the overall radiant fraction is impacted by the choice of soot radiative property model.
Article
Engineering, Multidisciplinary
Yinsheng Li, Jing Yang, Jinxiang Chen, Jian Yin
Summary: This study investigated the heat transfer performance and intrinsic heat transfer mechanism of laminated honeycomb panels (LHPs) with different structural parameters using a heat flow meter. The results showed that the equivalent thermal conductivity of the LHPs was almost independent of the cell size when the single-layer thickness was small. A heat transfer model was developed, and it was concluded that the performance of the honeycomb core greatly affected the heat transfer performance of the LHPs. The study also revealed the intrinsic heat transfer mechanism affecting the heat transfer performance of LHPs.
Article
Energy & Fuels
Mehmet Soner Yasar, Nevin Selcuk, Gorkem Kulah
Summary: A 1-D model for a BFBC co-firing lignite with cotton residue and limestone is coupled with a 3-D spectral and gray radiation models. The performance of the models is assessed by comparing their predictions with measurements from a BFBC. Comparisons between models with and without radiation show that the spectral model only slightly improves the predictions, due to the small temperature difference between the freeboard and walls and the dominance of combustion gases and particles in radiative heat transfer.
Article
Energy & Fuels
Antonio Garcia, Javier Monsalve-Serrano, David Villalta, Maria Guzman-Mendoza
Summary: Recent investigations have shown advancements in combustion strategies and fuel exploration for internal combustion engines. Findings indicate that diesel-methanol fuel blends exhibit comparable performance to diesel-gasoline blends, while substituting diesel with OMEx has the potential to meet EURO VI and potential EURO VII emission standards.
Article
Thermodynamics
Bernardo Tormos, Jose M. Garcia-Oliver, Marcos Carreres, Carlos Moreno-Montagud, Beatriz Dominguez, Maria Dolores Cardenas, Fermin Oliva
Summary: Low-speed pre-ignition (LSPI) in Direct Injection Spark Ignition (SI) engines remains a challenge due to its potential to induce heavy knock. This study aims to determine the ignition propensity of lubricant oils using optical techniques, finding that base oil formulation impacts ignition delay while additives, aging, and oxidation have minimal effect.
INTERNATIONAL JOURNAL OF ENGINE RESEARCH
(2022)
Article
Thermodynamics
Jose V. Pastor, Antonio Garcia, Carlos Mico, Felipe Lewiski
Summary: Blending OME X with diesel can help overcome some limitations of OME X while maintaining low soot formation trends. The flame light intensity scales with diesel fraction up to 30% in the blend, and spectroscopy analysis shows nearly zero soot formation for OME X fuel.
COMBUSTION AND FLAME
(2021)
Article
Thermodynamics
Jose Pastor, Jose M. Garcia-Oliver, Carlos Mico, Alba A. Garcia-Carrero
Summary: This research compares two injectors for different fuels in terms of spray characteristics and combustion behavior, showing that the Spray D injector has longer liquid length, faster vapor penetration, higher ignition delay, and longer lift-off length. The oxygenated fuel OME exhibits a different trend in ignition behavior compared to other fuels, and no soot production was observed with oxygenated fuels under any operating conditions.
INTERNATIONAL JOURNAL OF ENGINE RESEARCH
(2022)
Article
Thermodynamics
Antonio Garcia, Javier Monsalve-Serrano, Rafael Lago Sari, Alvaro Fogue Robles
Summary: The urgent need to reduce carbon dioxide emissions has led to powertrain electrification, but new hazards like battery pack combustion have emerged. Research on different reaction mechanisms for lithium-ion batteries is ongoing, with results showing that the mechanism proposed by Kriston provides the best trade-off in simulating thermal runaway conditions.
INTERNATIONAL JOURNAL OF ENGINE RESEARCH
(2022)
Article
Energy & Fuels
Antonio Garcia, Javier Monsalve-Serrano, Rafael Lago Sari, Santiago Martinez-Boggio
Summary: The study assesses the potential and challenges of using an RCCI engine in a series hybrid truck, with experimental results showing good agreement with numerical simulations and CO2 emissions below 3%. Using OMEx can further reduce NOx and soot emissions, with a potential CO2 reduction of over 25% compared to current commercial trucks.
Article
Energy & Fuels
Antonio F. Garcia, Javier Monsalve-Serrano, David Villalta, Maria Guzman-Mendoza
Summary: The current focus of internal combustion engine research is on reducing pollutant emissions while maintaining or improving efficiency and fuel consumption. Studying low carbon fuels (LCF) as an alternative seems promising, but testing a fuel with different properties requires significant resources. To address this issue, a cycle simplification methodology is proposed in this study to evaluate the homologation potential of the studied fuel.
Article
Thermodynamics
Peng Zhao, Antonio Garcia, Tristan Burton
Summary: As decarbonization and carbon neutrality become increasingly important, battery research has received more attention. This study focuses on the challenges of thermal runaway and its propagation in batteries, specifically in solid combustion. Through a large Ze number asymptotic analysis, the researchers explored the initiation and propagation of spherical and cylindrical reaction fronts. The results indicate that cylindrical reaction fronts have a smaller critical radius and minimum ignition energy, making them a greater concern for thermal runaway propagation triggered by nail penetration.
COMBUSTION AND FLAME
(2022)
Article
Thermodynamics
Antonio Garcia, Javier Monsalve-Serrano, Rafael Lago Sari, Shashwat Tripathi
Summary: This study explores different pathways to reduce CO2 emissions in urban public transportation systems through hybrid powertrains and alternative solutions such as e-fuels, obtaining valuable findings in the case study of Valencia.
Article
Thermodynamics
Antonio Garcia, Javier Monsalve-Serrano, David Villalta, Maria Gabriela Guzman
Summary: This study evaluates the impact of different injectors on emissions and performance of heavy and medium-duty vehicles, and determines the optimal hardware combination for achieving a balance between emissions and fuel consumption. The results indicate that a low flowrate injector, coupled with a cylinder-head that achieves a swirl ratio of 1.81, performs the best among the tested hardware combinations.
INTERNATIONAL JOURNAL OF ENGINE RESEARCH
(2023)
Article
Thermodynamics
Antonio Garcia, Javier Monsalve-Serrano, Santiago Martinez-Boggio, Shashwat Tripathi
Summary: Many countries are promoting the shift towards electric vehicles to reduce emissions, but electric vehicles still have emissions during their entire life cycle. The emissions vary based on the country's electricity generation mix. Additionally, electric vehicles are more expensive than internal combustion engine vehicles with a similar range.
ENERGY CONVERSION AND MANAGEMENT
(2022)
Review
Thermodynamics
Avinash K. Agarwal, Akhilendra P. Singh, Antonio Garcia, Javier Monsalve-Serrano
Summary: This article reviews the application of advanced low-temperature combustion strategies in reducing harmful emissions from diesel engines. The RCCI combustion mode shows great potential in combustion control, engine performance, and applicability. However, it faces challenges such as emissions at low loads and pressure rise rate at high loads, limiting its practical use. The dual-mode concept provides a solution by switching between different combustion modes. The article provides recent advancements, data analysis, and guidance on fuel selection, parameter optimization, and performance improvement in overcoming challenges and promoting practical application of the RCCI combustion mode.
PROGRESS IN ENERGY AND COMBUSTION SCIENCE
(2022)
Article
Thermodynamics
Nika Alemahdi, Antonio Garcia, Martin Tuner
Summary: Low-temperature combustion (LTC) is an attractive concept for sustainable modern combustion engines. This study evaluates the phi-sensitivity response of different fuel blends under different thermodynamic conditions. It also explores the link between accumulated low temperature heat release and latent heat of vaporization with the CR sensitivity of the blends.
INTERNATIONAL JOURNAL OF ENGINE RESEARCH
(2023)
Article
Thermodynamics
Antonio Garcia, Javier Monsalve-Serrano, Alberto Ponce-Mora, Alvaro Fogue-Robles
Summary: Pseudo-two-dimensional models based on physical processes are relevant and affordable with new technological advancements. However, selecting a reduced number of parameters is a challenge. This study proposes a methodology using a genetic algorithm to fit 14 critical parameters of lithium-ion cells and achieves high fidelity in simulating real transport applications.
Article
Energy & Fuels
Antonio Garcia, Jose Pastor, Javier Monsalve-Serrano, Erasmo Iniguez
Summary: This study evaluates the emission performance of four different fuel blends with varying renewable content in a compression ignition engine. The results show that the impact of these fuels on emissions varies under different measurement conditions. It is found that suitable fuel blends can reduce aldehyde and saturated hydrocarbon emissions, but have limited effect under mid-load conditions. Furthermore, optimized calibration can reduce nitrogen oxide emissions but increase aromatic and unsaturated hydrocarbon emissions. Overall, the study demonstrates the potential of these low-carbon fuels to meet regulatory requirements without sacrificing the emissions performance of unregulated species.
Article
Thermodynamics
Hai Zhao, Puzhen Gao, Xiaochang Li, Ruifeng Tian, Hongyang Wei, Sichao Tan
Summary: This study numerically investigates the interaction between flow-induced vibration and forced convection heat transfer in a tube bundle. The results show that the impact of flow-induced vibration on heat transfer varies in different flow velocity regions.
APPLIED THERMAL ENGINEERING
(2024)
Article
Thermodynamics
Rohit Chintala, Jon Winkler, Sugirdhalakshmi Ramaraj, Xin Jin
Summary: The current state of fault detection and diagnosis for residential air-conditioning systems is expensive and not suitable for widespread implementation. This paper proposes a cost-effective solution by introducing an automated fault detection algorithm as a screening step before more expensive tests can be conducted. The algorithm uses home thermostats and local weather information to identify thermodynamic parameters and detect high-impact air-conditioning faults.
APPLIED THERMAL ENGINEERING
(2024)
Article
Thermodynamics
A. Azimi, N. Basiri, M. Eslami
Summary: This paper presents a novel optimization algorithm for improving the water-film cooling system of photovoltaic panels, resulting in a significant increase in net energy generation.
APPLIED THERMAL ENGINEERING
(2024)
Article
Thermodynamics
Duc-Thuan Phung, Chin-Hsiang Cheng
Summary: In this study, a novel CFDMD model is used to analyze and investigate the behavior of thermal-lag engines (TLE). The study shows that the CFDMD model effectively captures the thermodynamic behavior of the working gas and the dynamic behavior of the engine mechanism. Additionally, the study explores the temporal evolution of engine speed and the influence of various parameters on shaft power and brake thermal efficiency. The research also reveals the existence of a thermal-lag phenomenon in TLE.
APPLIED THERMAL ENGINEERING
(2024)
Article
Thermodynamics
Haiying Yang, Yinjie Shen, Lin Li, Yichen Pan, Ping Yang
Summary: The purpose of this article is to find a measure to improve the interfacial thermal transfer of graphene/silicon heterojunction. Through molecular dynamics simulation, it is found that surface modification can significantly reduce the thermal resistance, thereby improving the thermal conductivity of the graphene/silicon interface.
APPLIED THERMAL ENGINEERING
(2024)
Article
Thermodynamics
Qiong Wu, Yancheng Wang, Haonan Zhou, Xingye Qiu, Deqing Mei
Summary: This article introduces a visible methanol steam reforming microreactor, which uses an optical crystal as an observation window and measures the reaction temperature in real-time using infrared thermography. The results show that under lower oxygen to carbon ratio conditions, the microreactor has a higher heating rate and a stable gradient in temperature distribution.
APPLIED THERMAL ENGINEERING
(2024)
Review
Thermodynamics
Giulia Manco, Umberto Tesio, Elisa Guelpa, Vittorio Verda
Summary: In the past decade, there has been a growing interest in studying energy systems for the combined management of power vectors. Most of the published works focus on finding the optimal design and operations of Multi Energy Systems (MES). However, for newcomers to this field, understanding how to achieve the desired optimization details while controlling computational expenses can be challenging and time-consuming. This paper presents a novel approach to analyzing the existing literature on MES, with the aim of guiding practical development of MES optimization. Through the discussion of six case studies, the authors provide a mathematical formulation as a reference for building the model and emphasize the impact of different aspects on the problem nature and solver selection. In addition, the paper also discusses the different approaches used in the literature for incorporating thermal networks and storage in the optimization of multi-energy systems.
APPLIED THERMAL ENGINEERING
(2024)
Article
Thermodynamics
Xuepeng Yuan, Caiman Yan, Yunxian Huang, Yong Tang, Shiwei Zhang, Gong Chen
Summary: In this study, a multi-scale microgroove wick (MSMGW) was developed by laser irradiation, which demonstrated superior capillary performance. The surface morphology and performance of the wick were affected by laser scan pitch, laser power, repetition frequency, and scanning speed. The MSMGW showed optimal capillary performance in alumina material and DI water as the working fluid.
APPLIED THERMAL ENGINEERING
(2024)
Article
Thermodynamics
Maofei Mei, Feng Hu, Chong Han
Summary: This paper proposes an effective local search method based on detection of droplet boundaries for understanding the dynamic process of droplet growth during dropwise condensation. The method is validated by comparing with experimental data. The present simulation provides an effective approach to more accurately predict the nucleation site density in future studies.
APPLIED THERMAL ENGINEERING
(2024)
Article
Thermodynamics
Rahul Kumar Sharma, Ashish Kumar, Dibakar Rakshit
Summary: The study explores the use of phase change materials (PCM) as a retrofit with Heating Ventilation and Air-conditioning systems (HVAC) to reduce energy consumption and improve air quality. By incorporating PCM with specific thickness and fin configurations, significant energy savings can be achieved in comparison to standard HVAC systems utilizing R134a. This research provides policymakers with energy-efficient and sustainable solutions for HVAC systems to combat climate change.
APPLIED THERMAL ENGINEERING
(2024)
Article
Thermodynamics
Zhenhua Ren, Xiangjin Meng, Xingang Qi, Hui Jin, Yunan Chen, Bin Chen, Liejin Guo
Summary: This paper investigates the heat transfer mechanism and factors influencing thermal radiation in the process of supercritical water gasification (SCWG) of coal, and proposes a comprehensive numerical model to simulate the process. Experimental validation results show that thermal radiation accounts for a significant proportion of the total heat exchange in the reactor and a large amount of radiant energy exists in the important spectral range of supercritical water. Enhancing radiative heat transfer can effectively increase the temperature of the reaction medium and the gasification rate.
APPLIED THERMAL ENGINEERING
(2024)
Article
Thermodynamics
Mauro Abela, Mauro Mameli, Sauro Filippeschi, Brent S. Taft
Summary: Pulsating Heat Pipes (PHP) are passive two-phase heat transfer devices with a simple structure and high heat transfer capabilities. The actual unpredictability of their dynamic behavior during startup and thermal crisis hinders their large-scale application. An experimental apparatus is designed to investigate these phenomena systematically. The results show that increasing the number of evaporator sections and condenser temperature improves the performance of PHP. The condenser temperature also affects the initial liquid phase distribution and startup time.
APPLIED THERMAL ENGINEERING
(2024)
Article
Thermodynamics
Ke Gan, Ruilian Li, Yi Zheng, Hui Xu, Ying Gao, Jiajie Qian, Ziming Wei, Bin Kong, Hong Zhang
Summary: A 3-dimensional enhanced heat pipe radiator has been developed to improve heat dissipation and temperature uniformity in cooling high-power electronic components. Experimental results show that the radiator has superior heat transfer performance compared to a conventional aluminum fin radiator under different heating powers and wind speed conditions.
APPLIED THERMAL ENGINEERING
(2024)
Article
Thermodynamics
Xinyi Zhang, Shuzhong Wang, Daihui Jiang, Zhiqiang Wu
Summary: This study focuses on recovering waste heat from blast furnace slag using dry centrifugal pelletizing technology. A comprehensive two-dimensional model was developed to analyze heat transfer dynamics and investigate factors influencing heat exchange efficiency. The findings have important implications for optimizing waste heat recovery and ensuring safe operations.
APPLIED THERMAL ENGINEERING
(2024)
Article
Thermodynamics
Xincheng Wu, An Zou, Qiang Zhang, Zhaoguang Wang
Summary: The boosting heat generation rate of high-performance processors is challenging traditional cooling techniques. This study proposes a combined design of active jet intermittency and passive surface modification to enhance heat transfer.
APPLIED THERMAL ENGINEERING
(2024)
